JPS5822817Y2 - Waterproof structure of hinge part of automobile opening/closing lid - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waterproof structure that seals the abutment surface between the hinge and the hinge mounting portion of the vehicle body in the hinge portion of an automobile opening/closing lid to provide a rust-proofing effect.

Conventionally, the hinge part of the opening/closing lid has a structure in which the hinge is connected to the vehicle body body and the vehicle body hinge attachment part of the opening/closing lid with tightening bolts, but water can enter between the hinge attachment part and the hinge. Rust is easy to occur, so various anti-rust treatments are applied.

For example, this conventional technology involves applying a rust-preventing primer such as a zinc clinch primer to the hinge mounting part of the vehicle body and the hinge during the previous sheet metal process for hinge assembly, but this is a painting process that involves harmful organic solvents. Therefore, it requires a workplace equipped with special ventilation equipment, and since it is a flammable substance, it has the disadvantage of being dangerous in workplaces where fire is present, such as in sheet metal processes.

Furthermore, methods in which a polyvinyl chloride sealant is mainly applied around the hinge after electrodeposition coating has the disadvantage of poor workability and the inability to ensure reliable application of the sealant in the mass production process. When painting, it is expected that the gap between the hinge and the hinge attachment part of the vehicle body will be painted at the same time, but in reality, it is hardly ever painted.

In order to eliminate such conventional drawbacks, the present invention connects the hinge and the hinge attachment part of the vehicle body with a tightening bolt through a synthetic resin film layer that is fused at the mating surface of the two. Therefore, it is an object of the present invention to provide a waterproof structure for the hinge portion of the opening/closing lid, which has a simple structure in which the synthetic resin film layer seals the space between the two and provides a reliable rust prevention effect.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In an automobile 1 shown in FIG. 1, an opening/closing lid 3 is provided at the rear of a vehicle body 2 and is pivotably supported at an upper end so as to be openable and closable.

As shown in FIG. 2, the hinge 4 of the opening/closing lid 3 has fixing pieces 4 provided on the pin 4a so as to be able to swing freely relative to each other.
b and a swinging piece 4c, and this fixed piece 4b' and the sheep attachment part of the vehicle body 2 are made of a heat-fusible synthetic resin film layer that is fused at the mating surface thereof. The swing piece 4c is attached to the upper frame 3a of the opening/closing lid 3 with a bolt 7, and the opening/closing lid 3 is pivotally supported so that it can be opened and closed.

Note that 3b is the glass of the opening/closing lid 3, 3C is its attachment sealing material, and 8 is a sealing gasket attached to the vehicle body 2.

The synthetic resin film layer 5 is formed by inserting a heat-adhesive synthetic resin film between the hinge 4 and the vehicle body 2 in the sheet metal process and tightening it with bolts 6, and in the drying process after painting in a drying oven. By heating at a drying temperature of 140° C. to 160° C., the heat-fusible synthetic resin film becomes fluid, which allows it to be fused to the mating surfaces of the hinge 4 and the vehicle body 2. , which provides waterproofness to the hinge part.

The material of the heat-fusible synthetic resin film layer 5 is a thermoplastic synthetic resin or thermosetting synthetic resin that has moderate hardness at room temperature, temporarily becomes fluid when heated, and then hardens. is used.

Thermoplastic synthetic resins exhibit plasticity that allows them to be freely deformed when the temperature rises, but once they are cooled and the temperature falls, they become hard again. On the other hand, thermosetting synthetic resins are synthetic resins that have the property of increasing the degree of polymerization and hardening due to a chemical reaction caused by heating, and maintain that state even when the temperature is lowered.For example, epoxy resins Synthetic resin is used.

In these synthetic resins, the flow start temperature range is 120
Use one with a temperature of about 150°C to 150°C.

Note that since thermoplastic synthetic resin exhibits plasticity each time it is heated, it is preferable to use thermosetting synthetic resin in consideration of reducing the tightening force of the bolt 6.

Further, the reduction in the tightening force of the bolt 6 due to the softening of the heat-fusible synthetic resin film layer 5 cannot be completely eliminated even if a thermosetting synthetic resin is used.

Therefore, in order to minimize the decrease in the tightening force and obtain sealing properties by fusion, the thickness of the heat-fusible synthetic resin film layer 5 should be set to 0.05 to 0.1 rrrrn.
It is preferable to do it to a certain extent.

On the other hand, if the surface precision of the adhesive surface of the heat-fusible synthetic resin film layer 5 cannot be obtained in the vehicle body 2 or the hinge 4, the thickness of the heat-fusible synthetic resin film layer 5 may be increased to match the thickness of the heat-fusible synthetic resin film layer 5. The reduction in the tightening force of the bolt 6 due to softening may be compensated for by tightening the bolt 6 again after fusion in the drying process.

At that time, in order to minimize the reduction in the tightening force, as shown in FIG. It is also possible to use a laminated heat-fusible synthetic resin film 9 and fuse the fusing layers 9b on both sides to the vehicle body 2 and the hinge 4, respectively.

Note that the synthetic resin film layer formed by the heat-fusible synthetic resin film layer 5 or the film 9 is attached to the hinge 4.
and the opening/closing lid 3.

Therefore, according to the above-described waterproof structure of the present invention, between the hinge connected by the tightening bolt and the vehicle body hinge attachment part of the vehicle body or the opening/closing lid, the structure itself is fused at the mating surface between the two. By providing the synthetic resin film layer, it is possible to completely seal the abutment surface between the hinge and the vehicle body hinge mounting portion to prevent water from entering and rust to occur.

That is, according to the salt spray test, the waterproof structure of the present invention has a rating of 50
Although it was in good condition with no rust even after 0 hours passed,
In the case of the conventional technology where anti-corrosion primer was applied, red rust developed from the surrounding area after 240 hours, and in the case of the case where sealant was applied, peeling occurred between the seal and the hinge, and red rust appeared in some areas after about 400 hours. , those using only electrodeposition coating are 10
Red rust appeared from the surrounding area at 0 hours.

Furthermore, according to the present invention, the heat-fusible synthetic resin film can be placed in the paint drying oven while being held between the hinge mounting part of the vehicle body and the hinge with the tightening bolt, so it is not necessary to separately install the heat-fusible synthetic resin film during fusing. There is no need to provide a means to hold the film,
However, by interposing the synthetic resin film layer, the hinge mounting part of the car body and the hinge are integrated through the synthetic resin film layer, so the surface precision of the mating surfaces is particularly important for the hinge mounting part of the car body and the hinge. This eliminates the need to raise the height, simplifies manufacturing, and reduces the possibility of rattling between the hinge mounting portion of the vehicle body and the hinge, increasing mounting rigidity, which has some excellent practical advantages.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view showing the rear part of an automobile, Fig. 2 is an enlarged sectional view taken along line A-A in Fig. 1, and Fig. 3 is a thermal fusion FIG. 3 is an enlarged cross-sectional view showing another example of an adhesive synthetic resin film. 1...car, 2...car body, 3...
...Side closing lid, 4...Hinge, 5...Synthetic resin film layer, 9...Heat-fusible synthetic resin film.

Claims (1)

[Scope of utility model registration request] Between the hinge and the hinge attachment part of the vehicle body, there is a synthetic resin film layer that is interposed and fused at the mating surface of the hinge and the hinge attachment part of the vehicle body. A waterproof structure for a hinge portion of an automobile opening/closing lid, characterized in that the two are connected by a tightening bolt, and the space between the two is sealed by a synthetic resin film layer.